拉格都水电站泄洪工程布置与护岸设计

Layout of Release Works and Design of Revetment of Lagdo Hydropower Station

拉格都水电站工程水库总库容 86 .9亿m3,装机容量 72MW。拦河大坝为粘土心墙堆石坝 ,最大坝高 40m ,其泄水建筑物由泄洪洞和溢洪道组成。泄洪洞布置在主坝右岸 ,为导流、泄洪、放空水库三结合的无压隧洞 ,洞身为城门洞形 ,出口段两侧边扩散并采用连续式挑流消能 ,后接长约 5 5 0m的尾水渠 ,将水流导入主河床。溢洪道平均宽 42m ,戽流消能 ,消力戽后接 2 0m长的护坦 ;引水渠位于左岸 ,是导流、泄洪、发电、灌溉四结合的建筑物。工程竣工后的情况表明 ,枢纽布置是合理的 ,大坝能安全拦洪 ,但因投资等因素限制 ,溢洪道和泄洪洞下游未作周密的防护 ,发生不同程度的冲刷。为此 ,针对泄洪洞和溢洪道出口下游冲刷流态等实际情况 ,进行了护岸工程的设计和施工。护岸工程投入使用后 。

The Lagdo Hydropower Station has a storage volume of 8.69 billion m 3 and an installed capacity of 72 MW.The clay core rockfill dam is 40m high with its release works consisting of a spillway and a release outlet.The release outlet is arranged on the right bank of the main dam and is a free_flow tunnel for diversion,flood disposal and emptying the reservioir.The tunnel is in the form of an archway,with its mouth expanding toward both sides and dissipating energy by continuous deflector.Next comes the 550m long tailrace directing the flow into the main river bed.The spillway is 42m in width in average with bucket to dissipate energy.Behind the bucket is a 20m long apron.Situated on the left bank,the headrace channel is a structure for diversion,flood disposal,power generation and irrigation.After completion,it has been shown that the project layout is reasonable and the dam works satisfactorily in flood detention.However,scouring in different degrees has occurred downstream the spillway and the release tunnel.In the light of this situation,a revetment has been designed and constructed.The revetment works well since putting into operation.